Simple Listbox Ordering using a CollectionViewSource

1 - Original Listbox.xaml

<ListBox ItemsSource="{Binding List}" />

2 - Namespace.xaml

xmlns:cm="clr-namespace:System.ComponentModel;assembly=System.Windows"

3 - Page Resource.xaml

<CollectionViewSource x:Key="ListViewSource" Source="{Binding List}">
    <CollectionViewSource.SortDescriptions>
        <cm:SortDescription PropertyName="Name" Direction="Ascending" />
    </CollectionViewSource.SortDescriptions>           
</CollectionViewSource>

4 - New Listbox.xaml

<ListBox ItemsSource="{Binding Source={StaticResource ListViewSource}}" />